# How it works
## Format changes
### V1 to V2
The way enums are expressed for canvas shaders was changed, 
now values are no longer constant numbers but instead booleans expressing whether they are selected.

## A quick tour
In ResourcePackManagerMixin, the conf.json will be parsed and saved to a map in the main class. 
Now, whenever a resource is accessed, the mixins under conditions/ will check if a .rpo file exists
for the current resource and parse it if that is the case. 
If a resource is "hidden", openFile will throw a FileNotFoundException and containsFile will return false,
essentialy preventing the game from even knowing the resource exists.

## Canvas integration
Grondag implemented an API into frex to allow RPO to supply a custom shader file which other may include,
the code is generated by each individual entry class.